diff --git a/.changelog/php83-header-runtime.md b/.changelog/php83-header-runtime.md
deleted file mode 100644
index 8aead88..0000000
--- a/.changelog/php83-header-runtime.md
+++ /dev/null
@@ -1,6 +0,0 @@
----
-category: fixed
-type: patch
----
-
-Keep header helpers compatible with PHP 8.3 without mbstring or development polyfills, using ASCII HTTP whitespace and token case folding while preserving credential values.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9affb6f..bb3c00f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.5.1] - 2026-10-21
+
+### Fixed
+
+- Keep header helpers compatible with PHP 8.3 without mbstring or development polyfills, using ASCII HTTP whitespace and token case folding while preserving credential values. ([#14](https://github.com/php-fast-forward/http-message/pull/14))
+
 ## [1.5.0] - 2026-10-21
 
 ### Added
@@ -36,6 +42,7 @@ Release notes are unavailable for this version.
 
 Release notes are unavailable for this version.
 
+[1.5.1]: https://github.com/php-fast-forward/http-message/compare/v1.5.0...v1.5.1
 [1.5.0]: https://github.com/php-fast-forward/http-message/compare/v1.4.0...v1.5.0
 [1.4.0]: https://github.com/php-fast-forward/http-message/compare/v1.3.0...v1.4.0
 [1.3.0]: https://github.com/php-fast-forward/http-message/compare/v1.2.0...v1.3.0